Migrate content/common/gpu/media code to media/gpu

content/common/gpu/media/vp9_decoder.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_COMMON_GPU_MEDIA_VP9_DECODER_H_
-#define CONTENT_COMMON_GPU_MEDIA_VP9_DECODER_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <memory>
-#include <vector>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "content/common/gpu/media/accelerated_video_decoder.h"
-#include "content/common/gpu/media/vp9_picture.h"
-#include "media/filters/vp9_parser.h"
-
-namespace content {
-
-// This class implements an AcceleratedVideoDecoder for VP9 decoding.
-// Clients of this class are expected to pass raw VP9 stream and are expected
-// to provide an implementation of VP9Accelerator for offloading final steps
-// of the decoding process.
-//
-// This class must be created, called and destroyed on a single thread, and
-// does nothing internally on any other thread.
-class CONTENT_EXPORT VP9Decoder : public AcceleratedVideoDecoder {
- public:
-  class CONTENT_EXPORT VP9Accelerator {
-   public:
-    VP9Accelerator();
-    virtual ~VP9Accelerator();
-
-    // Create a new VP9Picture that the decoder client can use for initial
-    // stages of the decoding process and pass back to this accelerator for
-    // final, accelerated stages of it, or for reference when decoding other
-    // pictures.
-    //
-    // When a picture is no longer needed by the decoder, it will just drop
-    // its reference to it, and it may do so at any time.
-    //
-    // Note that this may return nullptr if the accelerator is not able to
-    // provide any new pictures at the given time. The decoder must handle this
-    // case and treat it as normal, returning kRanOutOfSurfaces from Decode().
-    virtual scoped_refptr<VP9Picture> CreateVP9Picture() = 0;
-
-    // Submit decode for |pic| to be run in accelerator, taking as arguments
-    // information contained in it, as well as current segmentation and loop
-    // filter state in |seg| and |lf|, respectively, and using pictures in
-    // |ref_pictures| for reference.
-    //
-    // Note that returning from this method does not mean that the decode
-    // process is finished, but the caller may drop its references to |pic|
-    // and |ref_pictures| immediately, and the data in |seg| and |lf| does not
-    // need to remain valid after this method returns.
-    //
-    // Return true when successful, false otherwise.
-    virtual bool SubmitDecode(
-        const scoped_refptr<VP9Picture>& pic,
-        const media::Vp9Segmentation& seg,
-        const media::Vp9LoopFilter& lf,
-        const std::vector<scoped_refptr<VP9Picture>>& ref_pictures) = 0;
-
-    // Schedule output (display) of |pic|.
-    //
-    // Note that returning from this method does not mean that |pic| has already
-    // been outputted (displayed), but guarantees that all pictures will be
-    // outputted in the same order as this method was called for them, and that
-    // they are decoded before outputting (assuming SubmitDecode() has been
-    // called for them beforehand). Decoder may drop its references to |pic|
-    // immediately after calling this method.
-    //
-    // Return true when successful, false otherwise.
-    virtual bool OutputPicture(const scoped_refptr<VP9Picture>& pic) = 0;
-
-   private:
-    DISALLOW_COPY_AND_ASSIGN(VP9Accelerator);
-  };
-
-  VP9Decoder(VP9Accelerator* accelerator);
-  ~VP9Decoder() override;
-
-  // content::AcceleratedVideoDecoder implementation.
-  void SetStream(const uint8_t* ptr, size_t size) override;
-  bool Flush() override WARN_UNUSED_RESULT;
-  void Reset() override;
-  DecodeResult Decode() override WARN_UNUSED_RESULT;
-  gfx::Size GetPicSize() const override;
-  size_t GetRequiredNumOfPictures() const override;
-
- private:
-  // Update ref_frames_ based on the information in current frame header.
-  void RefreshReferenceFrames(const scoped_refptr<VP9Picture>& pic);
-
-  // Decode and possibly output |pic| (if the picture is to be shown).
-  // Return true on success, false otherwise.
-  bool DecodeAndOutputPicture(scoped_refptr<VP9Picture> pic);
-
-  // Called on error, when decoding cannot continue. Sets state_ to kError and
-  // releases current state.
-  void SetError();
-
-  enum State {
-    kNeedStreamMetadata,  // After initialization, need a keyframe.
-    kDecoding,            // Ready to decode from any point.
-    kAfterReset,          // After Reset(), need a resume point.
-    kError,               // Error in decode, can't continue.
-  };
-
-  // Current decoder state.
-  State state_;
-
-  // Current frame header to be used in decoding the next picture.
-  std::unique_ptr<media::Vp9FrameHeader> curr_frame_hdr_;
-
-  // Reference frames currently in use.
-  std::vector<scoped_refptr<VP9Picture>> ref_frames_;
-
-  // Current coded resolution.
-  gfx::Size pic_size_;
-
-  media::Vp9Parser parser_;
-
-  // VP9Accelerator instance owned by the client.
-  VP9Accelerator* accelerator_;
-
-  DISALLOW_COPY_AND_ASSIGN(VP9Decoder);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_MEDIA_VP9_DECODER_H_